CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Comprehensive income
Net earnings	$ 12,178	$ 7,376	$ 62,239	$ 34,261
Unrealized foreign currency translation adjustment, net of tax	700	1,090	981	657
Pension and other benefit adjustments:
Net loss arising during the period, net of tax			(45)
Prior service credit arising during the period, net of tax			746
Amortization of net (gain) loss reclassified into general and administrative: other, net of tax	7	(211)	(1,686)	(632)
Amortization of prior service credit reclassified into general and administrative: other, net of tax		(254)	(1,762)	(762)
Curtailment gain reclassified into general and administrative: other, net of tax			(7,239)
Settlement gain reclassified into general and administrative: other, net of tax			(175)
Marketable securities:
Unrealized net holding gain (loss) arising during the period, net of tax	(2,311)	(2,597)	(1,868)	762
Realized net gain reclassified into investment expense (income), net of tax	(5)	(10)	(154)	(25)
Equity method investees' cash flow hedge:
Unrealized net holding gain (loss) arising during the period, net of tax	(465)	408	(847)	136
Realized net loss reclassified into equity in earnings of non-consolidated entities, net of tax	112	134	351	397
Other comprehensive income (loss)	(1,962)	(1,440)	(11,698)	533
Total comprehensive income	$ 10,216	$ 5,936	$ 50,541	$ 34,794